git stderr: fatal: cannot exec '/tmp/appname/git-ssh.sh': Text file busy

### Steps to reproduce
Can not possible to reproduce. It happens complete randomly (random time, random projects, random servers).
We use `capistrano` with Jenkins to deploy apps to servers.

### Expected behavior
```bash
15:44:49 00:00 git:wrapper
15:44:49 01 mkdir -p /tmp/appname/
15:44:49 ✔ 01 deployer@10.10.10.10 0.259s
15:44:49 Uploading /tmp/appname/git-ssh.sh 100.0%
15:44:49 02 chmod +rx /tmp/appname/git-ssh.sh
15:44:49 ✔ 02 deployer@10.10.10.10 0.048s
15:44:49 00:00 git:check
15:44:49 01 git ls-remote --heads git@github.com:orgname/projectname.git
```

### Actual behavior
```bash
13:33:31 00:00 git:wrapper
13:33:31 01 mkdir -p /tmp/appname/
13:33:31 ✔ 01 deployer@10.10.10.10 0.219s
13:33:31 Uploading /tmp/appname/git-ssh.sh 100.0%
13:33:31 00:00 git:check
13:33:31 01 git ls-remote --heads git@github.com:orgname/projectname.git
13:33:31 01 fatal: cannot exec '/tmp/appname/git-ssh.sh': Text file busy
13:33:31 01 fatal: unable to fork
13:33:31 (Backtrace restricted to imported tasks)
13:33:31 cap aborted!
13:33:31 SSHKit::Runner::ExecuteError: Exception while executing on host 10.10.10.10: git exit status: 128
13:33:31 git stdout: Nothing written
13:33:31 git stderr: fatal: cannot exec '/tmp/appname/git-ssh.sh': Text file busy
13:33:31 fatal: unable to fork
13:33:31
13:33:31
13:33:31 Caused by:
13:33:31 SSHKit::Command::Failed: git exit status: 128
13:33:31 git stdout: Nothing written
13:33:31 git stderr: fatal: cannot exec '/tmp/appname/git-ssh.sh': Text file busy
13:33:31 fatal: unable to fork
13:33:31
13:33:31 Tasks: TOP => git:check
13:33:31 (See full trace by running task with --trace)
```

### System configuration
cap \ doctor [link](https://gist.github.com/maidmantis/f5cf38c80a196baaa002bc4502ab283e
)
### Additional Info
Found solution for similar issue:
just add bash command `sync` on remote server right after uploading instruction. It flushes all IO buffer to HDD.